Speck CandyShell Card Case for iPhone 4S/4
What it is: The Speck CandyShell Card Case for iPhone 4S/4 protects your iPhone while providing a handy slot to store credit cards and cash.
Why it's awesome: This case's rubberized slot holds plastic cards and money securely, so you don't need to carry a wallet or purse. The rubber lining also extends to the phone's bezel, which Speck says protects the screen if it falls face-first.
Where to buy: Newegg